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Патент USA US2123997

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July 19, 1938.
J. F. .méousEK
2,123,997
SHEEi‘ HOLDING MEANS FOR CYLINDERS OF PRINTING PRESSES AND THE LIKE’
Filed May 1, 1935'
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INVENTOR.
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ATTORNEY ,
‘I 7 2,123,997
Patented July 19, 1938v ‘
‘UNITED; STATES
PATENT, orrlcr.
2,123,997
SHEET-ROWING lVIEANS FOR CYLINDERS
OF PRINTING PRESSES AND‘ THE LIKE
Joseph F. Jirousek, Cleveland, Ohio, assignor to
‘The Chandler & Price Company, Cleveland,
Ohio, a corporation of Ohio
,
.
Application May 1, 1935, Serial No. 19,206
~‘ 7 Claims. (01. 101-4151)
This invention relates to means for holding
sheet material on cylinders. such as of printing
presses, lithographing presses and the like; and
it is among the objects of the invention to pro
5 vide a construction in which the operation of
clamping the sheet is simple and reliable. A
further object is the provision of structure in
which a pull of the sheet itself serves to tighten
the holding. A further object is the provision of
10 accuracy of alignment after the sheet is clamped.’
A still further object is the provision of quick
acting release for removal of the clamped sheet.
Other objects and advantages will appear as the
description proceeds.
_
To the accomplishment of the foregoing and
related ends, the invention, then, comprises the
features hereinafter fully‘described, and articuT
larly pointed out inpthe claims, the following de
scription and the annexed drawing setting forth.
20 in detail certain illustrative embodiments of the
invention, these being indicative however, of but
a few of the various ways in which the principle
of the invention may be employed.
In said annexeddrawing:—
25
'
Fig. 1 is a plan view of a cylinder embodying
the invention; Fig. 2 is a transverse section
thereof, on enlarged scale, taken- on a plane sub
stantially indicated by line 11-11, Fig. 1; Fig. 3
is a fragmentary similar view showing the parts
in releasing position; Figs. 4 and 5 are side eleva
tional and frontvelevational views respectively of
a detail of the clamping mechanism; and Figs.
6 and '1 are detail sectional views taken substan
tially on lines VI—VI and VII—'-VII, respectively,
Fig'. 1.
duced portions to serve as journalaland these
‘ride respectively in a fork H in the form of a
slide having a small excursion of movement on'
the plane of the base of the jaw. .The slide it
has'a stem extension l5 which rides through a 5
slide mounting opening'in'the baseljaw, and a
compression spring l6 surrounding" the stem and\
located between the slide and the jaw'abutments
serves to normally urge the slide into its for
,ward position. Rearwardly, of the jaw‘ member 10v
ID is a latch l'l pivoted to the jaw member at
It, and having an opening through which the
stem l5 extends, the opening being such-that the
stem passes freely through the latch but when
desired the stem may be pulled back by the
latch to release the jaw member l2, by reasonof
the latch coming against an abutment-pin IS on
the stem for such release movement;
The in
clined plane upon which the roller, l2 moves is
conveniently provided by end members if!’ se
cured to the base jaw It by suitable screws s.‘
With such arrangement, .the jaw-roller l2 with
its slide it may have ‘a range of movement within
the space between the jaw member iii and the
jaw member II, and as the roller moves for:
wardly it travels up the inclined plane surfaces
l3’, I3’ and thereby binds more tightly against
the plate to grip the same ‘against the jaw ll.
The latter may be knurled or roughened on its .
gripping surface.‘ Conversely, with movement 30
of the roller l2 rearwardly, it ‘travels down the
inclined plane surfaces and ‘recedes from its‘
gripping positionpthereby loosening the sheet,
rubber blanket,_or plate. The base jaws it are
~ set on a rock-shaft 20, and by provision of a
The cylinder body C may be of any usual or
preferred construction, and may involve for in
spring 2! between the shell 2, in a suitable abuti '
ment recess 22 for instance while the other end
stance a shell 2 having a ledge 3 upon which are
carried means for holding one end of a. sheet P,
such for instance as a zinc lithographic plate, such
rearward thrust on the jaws i0 is had, thus tend- ‘
means comprising a fixed jaw Q, and a cooperating
of the spring seats against an abutment plate 23
carried by the shank of the jaw Ill, a uniform
ing to maintain suitable tension and tightening
action upon the sheet being held. A screw head
24 may convenient-1y serve as centering and reg
tightening means, such as screws 7. Desirably, the taining means for the spring with respect to the
abutment plate 23. The jaw body l0, 1 I, may be ,
45 latter have recessed heads or an internal wrench- , swung forward on shaft 20 against the action of
hold 8, thereby offering little obstruction ex
the spring if a hand tool be inserted in a conven
ternally. With the sheet fastened by the series
of end-holding jaws 5, the body of the sheet is " ient hole 9 for this purpose, thus aifording a '
I
drawn around the cylinder to engage in the handle and leverage.
adjustable jaw 5, the latter being tightened into
holding position againstgthe end of the sheet 6 by
take-up holding jaws. These‘comprise relatively
?xed jaws 10, including an over-hanging beak
portion H, and a movable jaw member l2 in the
form of a roller mounted for limited rolling move
ment on an inclined plane or wedging plane l3.
55 Desirably, the rollers [2 have gudgeons or re
By providing the jaw member 4 in the form
of a bar in common for the entire set of end
clamps,,a_ nicety of adjustment after the sheet is
gripped, may be had. It sometimes occurs that
even when properly initially gauged, a sheet or
lithographic plate is ultimately found to be 5.5
2
.10
i
2,123,997
lghtly misaligned, and by the present. means
us may be corrected. By mounting the jaw-bar
and an inclined surface upon which said roller
4 on a central pivot, as bolt 25, it may be slightly
swung in’its plane with respect to the cylinder.
An adjusting thrust-screw 28 at each end of the
.bar, abutting'against a suitable surface on the
2. In mechanism of the character described, a
cylinder and means for holding sheet material
element may travel.
_
about its periphery, including a plurality of jaw
coupies for holding one end of the sheet to the
cylinder, said couples having each an interposed
cylinder thus serves to advance or retard one
end of the bar as compared with the other, ,as spring and a gauge pin, a bar in common mount
may be necessary in any given instance to skew _ ing said jaw-couples, a central pivot for said bar,
the sheet or plate sumciently to effect the desired
alignment.
The jaws l, 5, are provided with
gauge pins 21, these being ?xed in the jaw-bar
and projecting into openings 28 in the jaw 5. By
provision of a lip-lug 29 on the jaw 5, engage
ment of the latter relative to the jaw l is assured
in uniform manner, so'that the gauge pins 21
will always properly enter the openings 28 in the
cooperating jaw and not- interfere. The. jaw 5.
is normally urged into open position by a spring
20 30 between the jaws, centered about a retaining
pin 3i and seating at each end in appropriate
recesses in the jaw surfaces.
The manner of use of the device will be under;
stood from the foregoing. A sheet to be held in
25 position, for instance a zinc lithographic plate is
brought into position with one end in the jaws
a regulating screw at each endof said bar, and
self-tightening clamp means for the other end of
the sheet, said means having a roller-jaw ele
ment and a jaw element for receiving the same,
an inclined surface‘ upon which said roller ele
ment may travel, a slide for mounting said
roller-jaw element, a stem extending rearwardly
from said slide through said other jaw element,
and a spring interposed between said slide and
said other jaw element.
3. In mechanism of the character described, a 20
cylinder and means for holding sheet'material
about its periphery, including a plurality of jaw
.couples- for holding one 'end of the sheet to the
cylinder, said couples having each an interposed '
With the
spring and a gauge pin,'a bar in common mount 25
ing said jaw-couples, a central pivot for said bar,
a regulating screw at each end of said bar, and
self-tightening clamp means for the other end
of the sheet, said means having a roller-jaw ele
30 end of the plate pushed into position against the
ment and ajaw element for receiving the same, 30
I, 5, these being initially in open position, ‘the
screws 1 being released for that purpose so that
the springs 3D maintain them open.
row of gauge pins 21., the movable jaws are setv an inclined surface upon’which said roller ele
ment may‘ travel, a slide for ‘mounting said
down into clamping position by wrench-tighten
ing .each of the screws 1, and thereby this end roller-jaw element, a ,stem extending rearwardly
of the plate is gripped.
The plate is ‘then
35 wrapped around the cylinder and, as the opera
tor swings the jaws ll forwardly byQa hand
from said slide through said other jaw element,
a spring interposed between said slide and said
other jaw element, and a releasing latch for
.
wrench or tool inserted into one of the holes 9, engaging said stem.
4. In mechanism of the character described, a
the farther end of the plate is thrust into the
jaws II, and rides over the jaw-rollers l2, these - cylindur and means for: holding sheet material
40 being displaced backwardly on the give ‘of the about its periphery, including a plurality oi’ jaw- ’
springs l3, sufficiently to allow such admission,
but immediately on cessation of the thrusting
movement of the plate, the jaw-rollers I! hold
the plate. When it is desired to remove the
45
sheet P, the latches I‘! are drawn back from the
jaws ll thereby pulling the stems l5 and jaw
rollers l2. into release and the sheet may be
‘ drawn out of the jaws.
Undue movement of the .
jaw units III is guarded against in any position
ing by suitable stops. Thus, a ‘stop-projection
33 carried by the jaw at the rear, by vengaging
against the shoulder 34 on the cylinder prevents
the jaw being swung too far, back. A stop pro
56 jection 35 at the front of the jaw serves to abut
against the cylinder and prevent the jaw itself
from contacting closely.-
'
Other modes of applying the‘ principle of the
invention may be employed, change being'made
as regards the details described, provided ‘the
features set forthin any of the following claims,
or ,the equivalent of such, be employed.
. I therefore particularly point out‘ and dis
tinctly claim as my invention:—
65
1. In mechanism of the character described, a
cylinder and means for holding sheet material
about its periphery, including a plurality of jaw
couples for holding one end of the sheet to the
cylinder, said couples having each an interposed
70 spring and a gauge pin, a bar in common-mount
ing said jaw-couples, a central pivot for said bar,
a regulating screw at each end of said bar, and
self-tightening clamp means for the other end of
the sheet, said means having a roller-jaw ele—
76 ment and a jaw element for receiving the same,
couples for holding. one end of the sheet, each
couple having an interposed spring and a gauge
pin,- a bar for mounting said couples in common,
a pivot centrally of said bar, an adjustablescrew
at each end of said bar, and self-tightening
clamp means for the other end-of‘ the sheet. said
means having a plurality of roller-jaw elements,
cooperating jaw elements receiving the same,
‘a rock-shaft upon which said cooperating jaw
elements are carried, a spring normally swinging 50
said cooperating jaw elements rearwardly, and
an inclined plane surface upon which each
roller-jaw element may travel.
5. In mechanism of the character described, a i ,
cylinder and means for holding sheet material
about its periphery, including a plurality of jaw
couplesv for holding one end of the sheet, each
couple having an interposed spring and a gauge
pin, a bar for mounting said couples in common,
a pivot centrally of said bar, an adjustable screw 60
at each end of said bar, and self-tightening
clamp means for the other end of the sheet, said
means having a plurality of roller-jaw elements,
cooperating jaw elements receiving the same, a
rock-shaft upon which said cooperating jaw ele-‘ 65
ments are carried, a spring normally swinging
said cooperating jaw elements rearwardly, an in
clined plane surface upon which each roller-jaw
element may travel, a slide carrying each roller
jaw element,‘ a stern extending from said 'slide, 70
and a releasing latch for engaging said stem.
_ 6. In mechanism of the character described, a
cylinder and means for holding sheet material
about its periphery, including a jaw member ex
tending substantially the length of said cylinder.
9,123,997
means extending through said jaw member for
mounting the same pivotally to swing in the
plane‘ of the end of the sheet to be gripped, a
plurality of jaw elements mounted on said jaw
member and cooperating with the latter to grip
the sheet material, and adjusting screw means
for regulating the amount of swing-position of
said jaw member relative to the cylinder.‘
,
'7. In mechanism ‘of the character described, a.
0 cylinder and means for holding sheet material
about its periphery? including a jaw member en
.
-
-
r
3
tending substantially the length of said cylinder,
means ‘extending through said jaw member for
mounting the same pivotally to swing in the plane
of the end of the sheet to be gripped, a plurality
of jaw elements mounted on said jaw members
and cooperating withthe latter to grip the sheet
material, adjusting screw means for regulating
the amount 01' swing of said jaw member relative
to the cylinder, and springs interposed between
said jaw elements and jaw member.
-'
.
I
JOSEPH F. JIROUSEK.
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